/Engine/Source/Runtime/Experimental/Chaos/Public/GeometryCollection/GeometryCollectionClusteringUtility.h
Find the lowest common ancestor index of currently selected nodes. Returns INDEX_NODE if there is no common ancestor.
static int32 FindLowestCommonAncestor ( const [FManagedArrayCollection](API\Runtime\Chaos\GeometryCollection\FManagedArrayCollection) * GeometryCollection, const [TArray](API\Runtime\Core\Containers\TArray)< int32 > & SelectedBones )